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What weight of solute (mol. Wt. 60) is r...

What weight of solute (mol. Wt. 60) is required to dissolve in 180 g of water to reduce the vapour pressure to `4//5^(th)` of pure water ?

A

`140 g`

B

`134 g`

C

150 g

D

240 g

Text Solution

Verified by Experts

The correct Answer is:
C
`(P^(@)-P_(s))/(P_(s))=(W_(1)xxm_(2))/(m_(1)xxw_(2))`
`rArr (P^(@)-(4)/(5)xxP^(@))/((4P^(@))/(5))=(w_(1)xx18)/(60xx180)`
`:.w_(1)=(60xx180)/(4xx18)=150g`
Hence, (C) is the correct answer.
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